A seated man looking through a camera obscura at half a skeleton suspended upside down from a tripod as two men look on. Etching.

An eye in a star, the spokes of which divide the spectrum of colours; putti hold a prism, a telescope, a rod refracted in water, and a camera obscura; representing optics. Engraving by J. Chapman, 1820, after A.D. Macquin.

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